Real-time digital control, data acquisition, and analysis system for the DIII-D multipulse Thomson scattering diagnostic

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1141615· OSTI ID:6351604

Greenfield, C M; Campbell, G L; Carlstrom, T N; DeBoo, J C; Hsieh, C; Snider, R T; Trost, P K ^[1]

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1. General Atomics, San Diego, CA (USA)

A VME-based real-time computer system for laser control, data acquisition, and analysis for the DIII-D multipulse Thomson scattering diagnostic is described. The laser control task requires precise timing of up to eight Nd:YAG lasers, each with an average firing rate of 20 Hz. A cpu module in a real-time multiprocessing computer system will operate the lasers with evenly staggered laser pulses or in a burst mode,'' where all available (fully charged) lasers can be fired at 50--100 {mu}s intervals upon receipt of an external event trigger signal. One or more cpu modules, along with a LeCroy FERA (fast encoding and readout ADC) system, will perform real-time data acquisition and analysis. Partial electron temperature and density profiles will be available for plasma feedback control within 1 ms following each laser pulse. The VME-based computer system consists of two or more target processor modules (25 MHz Motorola 68030) running the VMEexec real-time operating system connected to a Unix-based host system (also a 68030). All real-time software is fully interrupt driven to maximize system efficiency. Operator interaction and (non-real-time) data analysis takes place on a MicroVAX 3400 connected via DECnet.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 6351604
• Journal Information: Review of Scientific Instruments; (USA), Vol. 61:10; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
ELECTRON TEMPERATURE
PLASMA DIAGNOSTICS
THOMSON SCATTERING
DATA ACQUISITION
DATA ANALYSIS
ELECTRON DENSITY
CLOSED PLASMA DEVICES
INELASTIC SCATTERING
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics